M4360 Sanding Sponges #600

M43 Series comes in #240 / #320 / #400 / #600 / #800, each sold separately.

From the manufacturer:

Each sanding sponge is a flexible abrasive block that can be utilized for both wet and dry sanding applications. It’s particularly advantageous for plastic models due to its ability to conform to the intricate shapes of the parts, enabling precise and even sanding without compromising delicate features.